package com.changgou.search.service.impl;


import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.util.JavaBeanInfo;
import com.changgou.search.pojo.SkuInfo;
import com.changgou.search.service.SearchService;
import org.apache.commons.lang.StringUtils;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.Operator;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.AggregationBuilder;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.terms.StringTerms;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortBuilders;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.data.elasticsearch.core.ElasticsearchTemplate;
import org.springframework.data.elasticsearch.core.SearchResultMapper;
import org.springframework.data.elasticsearch.core.aggregation.AggregatedPage;
import org.springframework.data.elasticsearch.core.aggregation.impl.AggregatedPageImpl;
import org.springframework.data.elasticsearch.core.query.NativeSearchQueryBuilder;
import org.springframework.stereotype.Service;

import java.util.*;
import java.util.stream.Collectors;

@Service
public class SearchServiceImpl implements SearchService {

    @Autowired
    private ElasticsearchTemplate elasticsearchTemplate;

    @Override
    public Map search(Map<String, String> searchMap) {
        Map<String, Object> resultMap = new HashMap<>();

        if (searchMap != null) {
            //组合条件对象
            BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
            //关键词
            if (!StringUtils.isEmpty(searchMap.get("keywords"))) {
                boolQuery.must(QueryBuilders.matchQuery("name", searchMap.get("keywords")).operator(Operator.AND));
            }

            //品牌名称
            if (!StringUtils.isEmpty(searchMap.get("brand"))) {
                boolQuery.filter(QueryBuilders.termQuery("brandName", searchMap.get("brand")));
            }

            //原生搜索实现类
            NativeSearchQueryBuilder nativeSearchQueryBuilder = new NativeSearchQueryBuilder();
            nativeSearchQueryBuilder.withQuery(boolQuery);

            //按照品牌进行分组(聚合)查询
            String skuBrand = "skuBrand";
            nativeSearchQueryBuilder.addAggregation(AggregationBuilders.terms(skuBrand).field("brandName"));

            //按照规格进行过滤查询
            for (String key : searchMap.keySet()) {
                if (key.startsWith("Spec_")) {
                    String value = searchMap.get(key).replace("%2B", "+");
                    boolQuery.filter(QueryBuilders.termQuery("specMap." + key.substring(5) + ".keyword", value));
                }
            }

            //按照规格进行分组(聚合)查询
            String skuSpec = "skuSpec";
            nativeSearchQueryBuilder.addAggregation(AggregationBuilders.terms(skuSpec).field("spec.keyword"));

            //按照价格区间查询
            if (!StringUtils.isEmpty(searchMap.get("price"))) {
                String[] prices = searchMap.get("price").split("-");
                if (prices.length == 2) {
                    boolQuery.filter(QueryBuilders.rangeQuery("price").lte(prices[1]));
                }
                boolQuery.filter(QueryBuilders.rangeQuery("price").gte(prices[0]));
            }

            //分页
            String pageNum = searchMap.get("pageNum");
            String pageSize = searchMap.get("pageSize");
            if (null == pageNum) {
                pageNum = "1";
            }
            if (null == pageSize) {
                pageSize = "30";
            }
            nativeSearchQueryBuilder.withPageable(PageRequest.of(Integer.parseInt(pageNum) - 1, Integer.parseInt(pageSize)));

            //排序查询
            //1.当前域 2.当前的排序操作
            if (!StringUtils.isEmpty(searchMap.get("sortField")) && StringUtils.isNotEmpty(searchMap.get("sortRule"))) {
                if ("ASC".equals(searchMap.get("sortRule"))) {
                    //升序
                    nativeSearchQueryBuilder.withSort(SortBuilders.fieldSort((searchMap.get("sortField"))).order(SortOrder.ASC));
                } else {
                    //降序
                    nativeSearchQueryBuilder.withSort(SortBuilders.fieldSort((searchMap.get("sortField"))).order(SortOrder.DESC));
                }
            }

            //高亮域
            HighlightBuilder.Field field = new HighlightBuilder
                    .Field("name")
                    .preTags("<span style='color:red'>")
                    .postTags("</span>");
            nativeSearchQueryBuilder.withHighlightFields(field);

            //执行查询,返回结果对象
            AggregatedPage<SkuInfo> aggregatedPage = elasticsearchTemplate.queryForPage(nativeSearchQueryBuilder.build(), SkuInfo.class, new SearchResultMapper() {
                @Override
                public <T> AggregatedPage<T> mapResults(SearchResponse searchResponse, Class<T> aClass, Pageable pageable) {
                    List<T> list = new ArrayList<>();
                    SearchHits hits = searchResponse.getHits();
                    if (hits != null) {
                        SearchHit[] hits1 = hits.getHits();
                        for (SearchHit hit : hits1) {
                            SkuInfo skuInfo = JSON.parseObject(hit.getSourceAsString(), SkuInfo.class);

                            Map<String, HighlightField> highlightFields = hit.getHighlightFields();
                            if (highlightFields != null && highlightFields.size() > 0) {
                                //替换数据
                                skuInfo.setName(highlightFields.get("name").getFragments()[0].toString());
                            }


                            list.add((T) skuInfo);
                        }
                    }
                    return new AggregatedPageImpl<T>(list, pageable, hits.getTotalHits(), searchResponse.getAggregations());
                }
            });
            //总条数
            resultMap.put("total", aggregatedPage.getTotalElements());
            //总页数
            resultMap.put("totalPages", aggregatedPage.getTotalPages());
            //查询结果集合
            resultMap.put("rows", aggregatedPage.getContent());
            //获取品牌聚合的结果
            StringTerms brandTerms = (StringTerms) aggregatedPage.getAggregation(skuBrand);
            List<String> brandList = brandTerms.getBuckets().stream().map(bucket -> bucket.getKeyAsString()).collect(Collectors.toList());
            resultMap.put("brandList", brandList);
            //获取规格聚合的结果
            StringTerms specTerms = (StringTerms) aggregatedPage.getAggregation(skuSpec);
            List<String> specList = specTerms.getBuckets().stream().map(bucket -> bucket.getKeyAsString()).collect(Collectors.toList());
            resultMap.put("specList", formartSpec(specList));

            //分页
            resultMap.put("pageNum", pageNum);
            return resultMap;
        }
        return null;
    }

    /*
    将规格数据进行转换
    '颜色':'黑色','尺码':'150度'
    '颜色':'蓝色','尺码':'200度'

    转化为:
    '颜色':'黑色,蓝色'
    '尺码':'150度,200度'
     */
    public Map<String, Set<String>> formartSpec(List<String> specList) {
        Map<String, Set<String>> resultMap = new HashMap<>();
        //
        if (specList != null && specList.size() > 0) {
            for (String specJsonString : specList) {
                //"颜色":"黑色"  "尺度":"150度"
                Map<String, String> specMap = JSON.parseObject(specJsonString, Map.class);
                //获取specMap的键specKey
                for (String specKey : specMap.keySet()) {
                    //获取值为set<String>集合
                    Set<String> specSet = resultMap.get(specKey);
                    if (specSet == null) {
                        specSet = new HashSet<>();
                    }
                    //将规格信息添加到set中
                    specSet.add(specMap.get(specKey));
                    //将set集合存入resultMap中
                    resultMap.put(specKey, specSet);
                }
            }
        }
        return resultMap;
    }
}
